Rapid x265 & x264 Video Encoding Using Hardware & StaxRip64

NVIDIA GPUs (as well as Intel processors with built-in GPU and a motherboard with built-in Intel graphics) are capable of hardware-based video encoding and can drastically decrease encoding time.

NVIDIA NVENC : H.264 –  NVIDIA CUDA capable cards (click for list) or H.265 – GeForce 900 series (Maxwell 2nd generation) or later. Click –> NVIDIA H.265 encoder information.

Intel QSVEncC: H.264 – 2nd thru 4th generation Intel processors or H.265 – 5th & 6th (+) generation Intel processors. Click –> Intel Quick Sync explained.

My setup: NVIDIA GeForce GTX950 (Purchased for $115 US):

  • 2GB 128-Bit GDDR5
  • Core Clock 1127 MHz
  • Boost Clock 1317 MHz
  • 1 x DL-DVI-I 1 x HDMI 3 x DisplayPort 1.2
  • 768 CUDA Cores
  • PCI Express 3.0 x16

Computer Mainboard/Processor :

  • ASUS M5A97 R2.0
  • AMD FX(tm)-8320 Eight-Core Processor

StaxRip 64 setting: NVIDIA H.265 – NVIDIA (acvuvid native).
Typical x265 HEVC encode times (approximate):
60-minute 1080p video: 8 min (compared to 1.5 hours for CPU encode).
60-minute 720p video: 3 min 30 sec (compared to 35+ min for CPU encode).
45-minute 720p video: 2 min 40 sec (compared to 30+ min for CPU encode).

1080p movie x265 HEVC encode time:
Example: Star Wars – Force Awakens (2hr 18min 21 GB BDRip original) took 3.75 hours to re-encode as x265 via CPU (Intel I7 3.5GHz). Encode using the NVIDIA GPU took 10 minutes to re-encode an equivalent quality 1080p 3 GB x265.

HEVC H.265 is the first codec efficient enough for the high-quality HD video portion of the video-audio composite file to be smaller than an accompanying 484 Kbps 5.1 audio track.

Screen grab .x264 verses .x265 (right click – save image to your computer or open image in new tab to view full-size 1280×714).
410 TEST.1.5min.720p.Orginal.70.9MB
The original 720p x264 file (with AC3 384kbps 6ch audio) is 2.65GB. The re-encoded high-quality 720p x265 file (with AC3 192kbps stereo audio) is 284MB (both files are equal duration – 1 hour). The x264 screen grab is from the original file. Even though the x265 screen grab is from an additional generation video, there is very little difference between the two images.


Cropping does not work with properly with NVEncC x264 and x265 encoders. Cropping does work with QSVEncC and AviSynth/VapourSynth encoders. Some weirdly encoded (usually older)  files may require the use of the AviSynth/VapourSynth encoder.160622-08 160622-06 160622-07